Fluorapatite Fleet M E, Pan Y American Mineralogist 82 (1997) 870-877 Site preference of rare earth elements in fluorapatite: Binary (LREE+HREE)- substituted crystals Sample: Pr,Er-FAp _database_code_amcsd 0001936 9.3845 9.3845 6.8901 90 90 120 P6_3/m atom x y z Biso Ca1 2/3 1/3 .00067 .81 Ca2 .99179 .24187 .25 .666 P .36854 .39757 .25 .485 O1 .4839 .3258 .25 .93 O2 .4670 .5876 .25 1.09 O3 .2564 .3406 .0710 1.25 F 0 0 .25 2.26